我有一个简单的活动，它通过 ArrayAdapter 将一些数据绑定到 listView。我在我的 onCreate 中敬酒。如果我让手机静置几秒钟，吐司就会再次出现。我完全不知道这是怎么发生的。我在下面发布我的代码。也许我错过了一些我不知道的应用程序不可或缺的东西。
package com.eghdk.myapp.gui;
import java.util.ArrayList;
import android.annotation.TargetApi;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.koushikdutta.async.future.FutureCallback;
import com.koushikdutta.ion.Ion;
import com.eghdk.myapp.R;
import com.eghdk.myapp.adapters.MyAdapter;
import com.eghdk.myapp.util.AppUtil;
import com.eghdk.myapp.util.MyPost;
public class ActivityMyBlog extends ListActivity {
MyAdapter adapter;
ArrayList<MyPost> myPostArrayList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_blog);
// Show the Up button in the action bar.
setupActionBar();
if (!AppUtil.isNetworkAvailable(this)) {
Log.d("", "No network.");
} else {
Log.d("", "Connection detected. Will try to load from web.");
loadDataFromWeb(1, 40);
}
if (adapter == null) {
Toast.makeText(this, "adapter is null", 0).show();
} else {
}
}
@Override
public Object getLastNonConfigurationInstance() {
return (getListAdapter());
}
/**
* Set up the {@link android.app.ActionBar}, if the API is available.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setupActionBar() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
// @Override
// public boolean onCreateOptionsMenu(Menu menu) {
// // Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.activity_my_blog, menu);
// return true;
// }
//
// @Override
// public boolean onOptionsItemSelected(MenuItem item) {
// switch (item.getItemId()) {
// case android.R.id.home:
// // This ID represents the Home or Up button. In the case of this
// // activity, the Up button is shown. Use NavUtils to allow users
// // to navigate up one level in the application structure. For
// // more details, see the Navigation pattern on Android Design:
// //
// //
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
// //
// NavUtils.navigateUpFromSameTask(this);
// return true;
// }
// return super.onOptionsItemSelected(item);
// }
public void loadDataFromWeb(int page, int count) {
myPostArrayList = new ArrayList<MyPost>();
Ion.with(
ActivityMyBlog.this,
"http://myblog.com/api/get_posts/?page=" + page + "&count="
+ count).asJsonObject()
.setCallback(new FutureCallback<JsonObject>() {
@Override
public void onCompleted(Exception e, JsonObject result) {
//Edited this json code out for easier reading
myPost.setAttachmenUrl("http://myblog.com/img.png");
myPost.setPostTitle("Title");
myPost.setPostContent("Content");
myPost.setPostUrl("http://myblog.com/mypost");
myPost.setAuthorName("EGHDK");
myPostArrayList.add(myPost);
}
// END OF EVERY POST LOOP
Log.d("DEBUG", "4");
adapter = new MyAdapter(ActivityMyBlog.this,
R.layout.row, myPostArrayList);
setListAdapter(adapter);
}
});
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
Intent intent = new Intent(this, ActivityMyBlogDetail.class);
intent.putExtra("atUrl", myPostArrayList.get(position)
.getAttachmenUrl());
intent.putExtra("content", myPostArrayList.get(position)
.getPostContent());
intent.putExtra("title", myPostArrayList.get(position)
.getPostTitle());
intent.putExtra("url", myPostArrayList.get(position).getPostUrl());
startActivity(intent);
}
}
这是我的isNetworkAvailable方法：
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager manager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
boolean isAvailable = false;
if (networkInfo != null && networkInfo.isConnected()) {
isAvailable = true;
}
return isAvailable;
}
这是我的 ArrayAdapter 中的 getView 方法：
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if (convertView == null) {
convertView = mInflater.inflate(R.layout.row, parent, false);
}
((TextView) convertView.findViewById(R.id.titleTextView)).setText(Html
.fromHtml(postsArrayList.get(position).getPostTitle()));
ImageView image = (ImageView) convertView
.findViewById(R.id.postImageView);
//Library to help with loading of images
UrlImageViewHelper.setUrlDrawable(image, postsArrayList.get(position)
.getAttachmenUrl());
((TextView) convertView.findViewById(R.id.subTextView)).setText(Html
.fromHtml(postsArrayList.get(position).getAuthorName()));
return convertView;
}
更新：
我有另一部手机用作秒表并尝试了两次。
两次我都强制关闭了应用程序。
我打开应用程序，屏幕在 2 分 45 秒后变暗，我敬酒。
我打开应用程序和屏幕 48 秒后我得到了祝酒词。
这个不对。我确定 android 应用程序生命周期不会像这样工作。一定是另一个问题。我在我的 Android 4.4 LG G2 上使用它。
更新 2：
插入日志
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.d("STOP", "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
}
结果：
01-20 04:42:51.792: D/STOP(4817): XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
01-20 04:42:51.852: D/(4817): No network. Will use values from database.
01-20 04:42:51.922: I/ActivityManager(4817): Timeline: Activity_idle id: android.os.BinderProxy@420465c0 time:15096283
01-20 04:42:52.432: D/STOP(4817): XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
01-20 04:42:52.512: D/(4817): No network. Will use values from database.